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Bart's grades are up a little this term. But Lisa's are way down...

Marge: Bart's grades are up a little this term. But Lisa's are way down.Homer: We always have one good kid and one lousy kid. Why can't both our kids be good?Marge: We have three kids, Homer.Homer: Marge, the dog doesn't count as a kid!Marge: No, Maggie!